Cloth-cutting machine



IVI. ZAWISTOWSKI.

CLOH CUTTING MACHINE.

APPLICATION man DEc.11.191a.

1 ,3 1 9,809. l Patented Oct. 28, i919.

ATTORNEY MARTIN ZAWISTOWSKI, 0F BROOKLYN, NEW YORK CLOTH-CUTTING MACHINE.

Application iiled December 11, 1918.

To 0N whom it may concern Be it known that I` MAn'i'iN Z \\\'is'r wski, a citizen of the United States. and a resident ofBr n klyn` in the` county of Kings and State of New York` have invented certain new and useful Improvi-ments in Cloth-Cutting Machines7 of which the following is a specification. h i

This invention is an improvement in cloth cutting machines of-the rotary knife type and relates particularly to the grinder or sharpener mechanism and the means for bringing it into and out of operative position. In my improved construction I employ an oscillatory operating iiieniber for swinging an oscillating grinder carrier into or out of engagement with the knife. I ain aware that it has heretofore been proposed to connect this operating member and the grinder carrier by a pair of intei'ineshing iiiiter gears. This necessitates a very eareful and accurate positioning of the. two axes so that they intersect in the same plane and the accurate positioning of the gears on the two shafts. In my improved construction I connect the two shafts by a fiexible n ieinber so disposed that power is transmitted through it as the operating member is oseillated. By means of my improved construetion. it is unnecessary to exercise any partieular care in locating the bearings of the two shafts in respect to each other as the axis of the grinder carrier may be materially below or at any desired angle in respect to the'axis of the operating member. Furthermore by lowering the axis of the grinder carrier, this axis may be brought nearer to the edge of the knife and the grinder carrier may be made correspondingly shorter and lighter. Furthermore, my improved construction is very niiieh cheaper to manufacture. easiir to adjust, easier to assemble, and eliminates any lost motion such as often occurs between the teeth of intermeshing gears. Y

In the accompanying drawings I have illustrated one embodiment of my invention, although it will of courseloe understood that yrious other forms may be designed within the scope of the appended claims and within the spirit of my invention.

In these drawings:

Figure 1 is a side elevation,

the grinder being in raised or inoperative position and Specification of Letters Patent.

Patented Oct. 28, 1919. Serial No. 266,231.

the electric motor beii'ig'renioved from the motor hase, and

Fig. i2 is a front view. the grinder being shown in lowered or operative position and the knife and its supporting parts being shown in section.

In the specific form illustrated there is employed the usual base 10 with its standard 11. on which is mounted a rotary knife 12. Connected to the. latter is a gear wheel 13 meshing with a pinion 1J: on a shaft connected to or forming an extension of the motor shaft. The standard 11 above the knife supports an operating member in the form of a shaft l5, having a crank handle 16 adjacent to the main handle 17 of the machine. This shaft l5 luis a gear wheel 1H thereon which meshes with a rack bar 19 disposed substantially parallel to the axis of the knife. This rack bar carries a knife guard 20 normally substantially following the. curved edge of the knife and disposed adjacent to and overthe latter but movable laterally, that is. in a direction substantially parallel to the axis of the knife to bring it away from the knife when it is desired to sharpen the latter. This form of guard and supporting operating mechanism therefor is more fully described and claimed in a copending application.

The standard 11 at the front end of the machine has a lug 2l upon which is mounted a grinder carrier Q2 by means of a pivot pin Q8. This pivot pin is shown as substantially parallel to the axis of the knife and below the axis of the shaft l5. The grinder carrier is sho-wn as having two spaced lugs for engagement upon opposite sides of the lug 2l and at its lower front or free end has oppositel y disposed slotted arms Q4 to which are connected the two grinder stones 25. These -have substantially parallel may be adjusted toward or from each other axes and in the slots of the arms 24;,ande-larve` their position .but with the sai-ily tangential. The two may be of the grinder gets down into operative relationsame or a different size partly dependent ship to the latter. upon the distance through which it is de- If the members upon which the flexible sired to swing the grinders upon a given romember is wound be comparatively large in tation of the shaft 15. A flexible member respect to the range of movement, it will 28 has one end secured to the periphery of be evident that the flexible member will folthe grooved wheel 26 and the other end selow only a portion of the periphery and that 70 cured to the periphery of the'gi'ooved wheel therefore complete grooved-wheels need not 27, the said member passing from the groove be employed as grooved sectors will be sufof one member to the groove of the other ficlent. The peripheries need not necessarily at the point where the two wheels are ap'- be concentric with the axis of oscillation as roximately tangential. The rotation of the a spiral surface would give an increased or a shaft 15 by the swinging of the crank 26 decreased rate of movement.

downwardly away from the handle 17 tends lHaving thus described my invention, what to wind up the flexible member 28 on the I claim as new and desire to secure by Leo grooved wheel 27 and correspondingly un ters Patent is: l wind it from the grooved wheel 26, thereby 1. A cloth cutting machine, having a rorotating-the latter and swinging the grindtary knife, an oscillatory grinder carrier ers from the position shown in Fig. 1 to the having its axis approximately parallel to the positionshown in Fig. 2. I preferably em axis of the knife, a shaft having its axis ploy a coil spring to effect the return moveslightly above the axis ofthe grinder carment of the parts from the position shown rier and substantially parallel to the plane in Fig. 2 to the position shown in Fig. 1, of the knife, apair of grooved wheels closely upon the release ofthe crank 26. Although adjacent'to each other, one secured to said this spring may be mounted at various dif shaft and the other to said grinder carrier, ferent points and secured in dierent ways, and a flexible connecting member having its I have shown merely by` way of example a ends secured to the peripheries of said 9o spring 30 encircling an extension of the grooved' wheels l for swinging said carrier pivot pin or shaft 23 and with one end conupon the rotation of said shaft.

neet-ed to this shaft and the other end an- 2. A cloth cutting machine of the rotary chored on the frame `and continually tendknife type, having an oscillatory shaft, a ing to rotate the pivot pin or shaft 23 in grooved wheel, anda pinion secured thereto, 95 such a direction as tov hold the grinder in a grinder carrier, a knife guard carrier, a raised position. The tension of this spring grooved pulley connected to one and a rack may be readily adjusted as desired. bar connected to the other, said rack bar Ido not wish to be limited to any' parmeshing with said pinion, and a flexible ticular form of flexible connecting member. member having its ends secured to said Merely by way of example I have shown grooved pulleys. this member 28 in the form of a helical wire 3. A cloth cutting machine of the rotary coil encircling and guiding a central wire 29, knife type, having an oscillatory shaft, a the ends of both the coil and the wire being pulley, and a pinion secured thereto, a connected to the two grooved wheels by set grinder carrier, a knife guard carrier, a screws extending into the peripheries of the pulley connected to one and a rack bar conlatter. I do not wish to be in any way nected to the other, said rack bar meshing limited 'to this particular construction, with said pinion, and a flexible member conalthough experience shows that it operates necting said grooved wheels. very satisfactorily. It will be noted that I f1. A cloth cutting machine of the rotary have shown the axis of the shaft 28 below knife type, including an oscillatory grinder V the axis of the shaft 25. This may be carrier, an oscillatory operating member lowered to a still further extent and result having its axisv at an angle to the axis of the in a corresponding shortening of the length carrier and slightly above the latter, a pair of the arm 22. As the flexible connecting of members, one secured to said carrier and member 28 merely passes from one grooved the other to said operating member, and a wheel to the other it is permissible that there flexible connecting member secured to each be considerable variation in the positioning of said operating members at points thereon of these axes, and therefore, less expense spaced from the -axes of oscillation and and time is involved in drilling the bearings adapted to wind upon one as it unwinds 12o for the shaft. -It will be noted that the shaft from the other in the swinging of said carl 15 serves to operate not only the grinder carrier.

rier but also the guard carrier and that asv Signed at New York city, in the county ythe shaft rotates, the gear wheel 18 acts on of New York, and State of New York, this the rack bar 19 to push the guard out of the 4th day 0f December, A. D. 1918. way and away from the knife before the MARTIN ZAWI'STOWSKI. 

